"Berlin, September, 1945. Two manuscripts are found in rubble, each one narrating conflicting versions of the life of an Irish spy during the war. One of them is the journal of a German military intelligence officer and anti-Nazi cowed into silence named Adrian de Groot, charting his relationship with his agent, friend, and sometimes lover, an Irishman named Frank Pike. In De Groot's narrative, Pike is a charismatic IRA fighter sprung from prison...